Piston



T. R OGATCHOFF.

PISTON.

APPLICATION FILED JAN. 25, 1 921.

Patented Oct. 241, 1922.

INVENTOR. 7/?[000/P5 F0 6/47'0/10/7 ATTORNEY.

THEODORE ROGATCHOFF, OlE BALTIMORE, MARYLAND.

PISTON.

Application filed January 25, 1921. Serial No. 439,820.

To all whom it may concern:

Be it known that l, THEODORE ROGAT- OHOFF, a citizen of the Republic ofRussia, residing at Baltimore, in the city of Baltimore and State ofMaryland, have invented certain new and useful Improvements in Pistons,of which the following is a specification, reference being had thereinto the accompanying drawings.

This invention relates to pistons and has for an object to provide asectional piston made up of a piston center and a bull ring embracingthe center, said ring providing the usual and ordinary means forreceiving and accommodating the piston packing.

A further object of the invention is to provide improved means forsecuring the bull ring to the piston center.

A further object of the invention is to provide an improvement overPatent No. 1,326,692, issued December 30, 1919.

A further object of the invention is to provide a bull ring which isshrunk onto the piston center with means for utilizing the shrinkage ofmetal'both circumferentially and laterally of the rin g.

With these and other objects in view the invention comprises certainnovel units, combinations, features, elements, arrangements andfunctions as will be hereinafter fully described and claimed.

lin the drawings:

Figure 1 is a diametrical sectional view through a piston with theimproved bull ring mounted thereon;

Figure 2 is an enlarged detail fragmentary sectional view taken on aradius showing a modified type of bull ring and connection;

. Figure 3 is a fragmentary detail sectional view taken on i a radiusand showing a slightly different type of cylinder center and means ofattaching;

Figure 4 is a fragmentary detail view taken on a radius of a differenttype of shoulder and ring connection, and

Figure 5 is a view in side elevation of the center and ring attached.including all of the four types shown at Figures 1-, 2, 3 and 4.

Like characters of reference indicate corresponding parts throughout theseveral views.

In the said Patent No. 1,326,692, the engagement between the bull ringand the piston was such that lateral shrinkage of the bull ring tendedto loosen the connection between the center and the ring instead oftightening the same. The present invention, therefore, involves the formof the piston center as the male member and the bull ring as the femalemember. Specifically, the piston center 10, as shown at Figures 1 and 2,or as shown at Figure 3, as 11, comprises a rib of some type extendingbeyond the general periphery of said center. Said rib may be as shown at12 in Figure 1 with substantially square cornered shoulders, or as shownat 13 in Figures 2 and 3 with inclined shoulders, or as shown at Figure4 having both shoulders inclined but one shoulder 14 inclined at a moreacute angle than the opposite shoulder 15.

lit is obvious that with the center as shown, if the bull ring isexpanded by heat it can be slipped over the center so that the .ribs 12or 13 will engage in complementary of upon the ring, the lateralshrinkage of the ringinot only binds about the periphery of the centerbut also contracts into gripping engagement with the rib. 'Thisarrangement produces a device which secures the ring to the center muchmoresecurely and effectively-and much more quickly and economically thancan be done by any other method or mechanism.

What I claim to be new is:

1. A piston comprising a center having a rib formed about its peripheryand a bull ring having a groove formed about its inner peripherycomplementary to the rib.upon the center, said ring being held inposition upon the center, by the contraction from a heated and expandedcondition.

2. A piston comprising a center and a bull ring, said center having arib-outstanding from its outer periphery and the ring being providedwith a complementary groove in its inner periphery, the saidperforations of the center and ring and the said rib and groove beingheld intimately in engagement.

hereunto affix my

